We bought 2 of these bags to help us with weight restrictions on charter flights while traveling in British Columbia. We ordered them for how lightweight they are. But we were concerned they wouldn’t live up to the temperature rating listed or that they would be of poor quality.

Upon arrival, we were impressed with how light the bags were and how small they packed. We took them out of sacks as others have recommended and let them fluff up. Quality seemed very nice -- a lot nicer than I was expecting for price!

In the field, we used them every night for a week sailing the coast north of Prince Rupert, BC. We had 2 bunks in a small cabin, each of us in our own bag. Evenings and early mornings were in low 40s (F). Boat didn’t have any heat and we had all hatches and windows open for ventilation. Bags were toasty warm! We used as comforters rather than zipping bags around us.

I took up camping with the family as of this summer. Our first day was a hot humid NJ day. We bought these large sleeping bags from Canway. They are nice but when it came down to cold weather, they just didn't hold up without a lot of layering. Forget about taking them on a primal camping trip. I bought this Naturehike for a potential hammock trip in Florida. I needed something lightweight for a 3 day pack but also warm enough when I got into the hammock.
So far I haven't been able to try it out in outdoor weather but to simulate some semblance of temperature I opened up the apartment windows to the outdoor air, turned of the AC and got into the bag with just work out clothes. It wasn't too cold but there were points of time I got chilly. If I zipped up fully I was ok. I can't say this is a scientific test but I do want to try it out. The bag says the transition temp is towards the 51 degree F mark. I have seen what 40 degrees is like when I was in Madison, WI this week. That is COLD for outside. I don't think any bag would be good enough unless you have lots of clothing underneath. So that is how I would look at any bag when you purchase it. What clothes will you wear underneath. If you are going out to the wilderness for a hunting trip, you need long johns, wool socks and a good fleece or down coat or vest to complement the bag. Also, getting out of the wind is a good thing.

I like the bag. I deliberated for a while but just decided to get this. I love the feeling, its super lightweight. The little bag it came in is super small (and cute because it is small). I didn't do it justice when I folded it up. You can see what happened in the pic, but after a few tries I think it will compact more. Also there is this black netting that comes with it. It looks like a laundry bag. I'm not sure what its for other than if you are in a rush and want to stuff it in there or maybe a camping bag for a hammock?

This is a comparison review of the Aegismax down mummy bag with this Naturehike rectangular bag.

Over the past year my partner and I have upgraded a few bits of our camping gear. Getting well-made, compact, and lightweight sleeping bags were on the list. We have pretty decent synthetic-fill summer-weight bags from a major brand, that have about 5yrs of use. Going to down-fill was the obvious path, and recent offerings on Amazon have shown that good-quality down products are available from smaller manufacturers at lower prices than the outdoor equipment market has seen before.

My wife wanted lots of foot room and a full dual-slider zipper to poke her feet out if it is warm. Naturehike's rectangular bag has met her needs very well this summer. The penalty for the roomy rectangle is about 4oz (compared to the Aegismax mummy) which is very reasonable. They could reduce the weight by at least an ounce if they put a light-weight zipper on it; instead they used a full-size YKK zip that will be reliable for years, without needing the light-touch that much ultralight gear requires. It is warm and cozy, with a cinch cord to draw the top opening together if it is particularly chilly. The advertised temperature limits seem to be reliable guidance. And the glossy water-repellant finish on the outside of the bag should help deep the down dry in the event the sleeper presses up against a tent wall damp with condensation. The compression stuff sack is made from a heavier nylon that will stand up to regular use.

I have found mummy bags to work fine for me, so I purchased an Aegismax (size large, I'm 6'/175#) last year and really like it as a integral part of my ultra-light 3-season kit. Compared to the Naturehike, the shell fabric is finer, almost gossamer, but the tight thread count keeps down from poking out. However, I do seem to find a feather or 2 loose about the tent each morning; I don't know how they get out, but they are coming from my bag somewhere. Pulling the mummy hood around my face works well to maximize heat retention, but I have yet to have it out in the 40s to need it. True to ultralight design priorities, the zipper stops mid thigh, so getting in and out requires a bit more movement. And the zipper is well-made but rather light; I have to slide it more gently and slowly, being a little careful to not catch the bag fabric. The compression stuff sack is made from the same fabric as the bag shell, which is perfectly adequate but requires a bit more care in handling.

Going to down-fill bags has reduced our sleeping gear volume by 1/2, and reduced the weight by 1/3. These 2 bags have met each of our priorities very well, and we wouldn't change our purchases. You can tell in the comparison photo that the Aegismax is more compact, in proportion to the weight savings. Cinching down on the compression straps makes them both even smaller! But if size/weight are not the priority for you, maybe some extra creature comforts will guide your decision. Either way, you can sleep cozy!

the sleeping bag seemed awful light and thin, so I was pleasantly surprised how warm it kept me even when temps dropped into the 40's. My only complaint was that it was a little narrow for me. I am 5' 10" and 180 Lbs. If you are bigger than that you may want to get something larger.

Excellent sleeping bag, light, warm, I recommend it to everyone!